CN219093931U - Output control circuit of inverter welding machine - Google Patents
Output control circuit of inverter welding machine Download PDFInfo
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- CN219093931U CN219093931U CN202223559992.0U CN202223559992U CN219093931U CN 219093931 U CN219093931 U CN 219093931U CN 202223559992 U CN202223559992 U CN 202223559992U CN 219093931 U CN219093931 U CN 219093931U
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Abstract
The utility model discloses an inverter welding machine output control circuit, wherein a voltage control mode module and a current control mode module adopt the same clock, an error amplifier amplifies errors generated by a reference voltage and a welding power supply output feedback signal to output error amplified voltage to the voltage control mode module, and the voltage control mode module compares the error amplified voltage with sawtooth waves to form voltage control voltage output pulses; the current calculation module calculates to obtain calculated voltage according to the reference voltage and the turn ratio of the transformer, and the current control mode module compares the calculated voltage with a current feedback signal output by the driving inverter circuit to form a current control voltage output pulse; the AND circuit outputs a voltage control voltage output pulse and a current control voltage output pulse phase to a control end of a switching tube of the driving inverter circuit. The utility model has low noise sensitivity in the power stage and can respond quickly to the current flowing through the switching tube of the driving inverter circuit when the load changes sharply or even is short-circuited.
Description
Technical Field
The utility model belongs to the circuit technology, and particularly relates to an output control circuit of an inverter welding machine.
Background
At present, the power output of the inverter welding machine has two different control modes, namely a current control mode and a voltage control mode.
The principle of the voltage control mode is shown in fig. 1, the power output voltage Vout of the inverter welding machine is constant voltage output, and the power output voltage Vout of the inverter welding machine is used as feedback voltage to be sent to an input end of the error amplifier.
The voltage control mode is used for comparing the error amplified voltage Ve with the sawtooth wave Vr to form an output pulse, controlling the on and off of a switching tube and regulating the magnitude of the power supply output voltage Vout of the inverter welding machine.
The main advantage of the voltage control mode is: firstly, the control is simple, a single feedback loop is generally adopted, and the design is easy; and secondly, the sensitivity to noise is low, and the stable sawtooth wave is adopted, so that the circuit is not influenced by other parameters of the circuit.
The main drawback of the voltage control mode is: in the event of abrupt load changes or even short circuits, the current pulse width does not react immediately due to the system response time, which can cause an instantaneous increase in the current through the switching tube or even damage.
The principle of the current control mode is shown in fig. 2, and the error amplification voltage Ve is compared with the voltage drop Vs of the current (corresponding to the current flowing through the switching tube) of the current sampling resistor Rs to form an output pulse, so that the switching tube is controlled to be turned on and off, and the output size is adjusted.
The current control mode has the main advantages that: the current flowing through the switching tube can be controlled by fast response to the current flowing through the switching tube, and the switching tube is ensured not to have the overcurrent problem.
Disadvantages of current control mode: when the duty ratio is more than 50%, subharmonic oscillation is generated, and slope compensation is needed; (II) noise in the power stage can have an impact on the system because the voltage drop Vs signal is derived from the power stage.
During welding, the load of the inverter welding machine is often in short circuit, such as striking arc starting of manual welding, intermediate molten drop transition, short circuit transition of gas shield welding and the like. In this case, if the voltage control mode is adopted, the switching device is easily damaged due to overcurrent, so that the current control mode is mostly adopted by the current inverter welding machine to ensure the stability of the switching device.
With the development of the switching device technology, the third-generation semiconductor materials represented by silicon carbide and gallium nitride are being applied to the design of inverter welding machines by virtue of the superior performances of high frequency, high efficiency, high power, high voltage resistance, high temperature resistance, strong radiation resistance and the like.
Compared with power devices such as a second-generation semiconductor material IGBT, the power device of a third-generation semiconductor material has high switching speed, so that noise generated in a switching process is larger, the defect that the power device is sensitive to noise in a power stage in a current control mode is particularly remarkable, noise of the whole system can be caused, and the system is unstable.
Disclosure of Invention
The utility model aims to solve the technical problem of providing an inverter welding machine output control circuit which has low sensitivity to noise in a power stage, can quickly respond to the current flowing through a switching tube of a driving inverter circuit when the load changes suddenly or even is in short circuit, and can control the current flowing through the switching tube to ensure that the switching tube cannot have an overcurrent problem.
In order to solve the technical problems, the output control circuit of the inverter welding machine provided by the utility model comprises an error amplifier 10, a current calculation module 11, a synchronous clock module 12, a voltage control mode module 13, a current control mode module 14, an AND circuit 15, a driving inverter circuit 16, a transformer 17 and a rectification output circuit 18;
the synchronous Clock module 12 is configured to provide the same Clock signal Clock to the voltage control mode module 13 and the current control mode module 14;
the positive and negative input ends of the error amplifier 10 are respectively connected with a reference voltage Vg and a welding power supply output feedback signal Vout, and output an error amplified voltage Ve to a voltage control mode module 13;
the voltage control mode module 13 compares the error amplified voltage Ve with the sawtooth wave Vr to form a voltage control voltage output pulse Vpwmv, and outputs the voltage control voltage output pulse Vpwmv to an input end of the and circuit 15;
the current calculation module 11 is configured to calculate a calculated voltage Vi according to the reference voltage Vg and the transformer turn ratio n, where vi=vg/n;
the current control mode module 14 compares the calculated voltage Vi with the current feedback signal Vpre output by the driving inverter circuit 16 to form a current control voltage output pulse Vpwmi, and outputs the current control voltage output pulse Vpwmi to the other input terminal of the and circuit 15;
the and circuit 15 performs phase-to-phase operation on the input voltage control voltage output pulse Vpwmv and the current control voltage output pulse Vpwmi, and outputs a PWM signal to a control terminal of a switching transistor driving the inverter circuit 16;
the output end of the driving inverter circuit 16 is connected with one end of a primary winding of the transformer 17;
the secondary winding of the transformer 17 is connected with a rectification output circuit 18;
the rectifying output circuit 18 rectifies and outputs the output of the secondary winding of the transformer 17.
Preferably, the voltage control mode module 13 includes a first PWM comparator and a first latch;
the positive input end and the negative input end of the first PWM comparator are respectively connected with the error amplification voltage Ve and the sawtooth wave Vr, and the output end of the first PWM comparator is connected with the R end of the first latch;
the first latch has its S terminal connected to the Clock signal Clock and its Q terminal outputting the voltage control voltage output pulse Vpwmv to one input terminal of the and circuit 15.
Preferably, the current control mode module 14 includes a second PWM comparator and a second latch;
the positive input end and the negative input end of the second PWM comparator are respectively connected with the calculated voltage Vi and the current feedback signal Vpre output by the driving inverter circuit 16, and the output end of the second PWM comparator is connected with the R end of the second latch;
the second latch has its S terminal connected to the Clock signal Clock and its Q terminal outputting the current control voltage output pulse Vpwmi to the other input terminal of the and circuit 15.
Preferably, the driving inverter circuit 16 employs a single switching tube or an H-bridge PWM driving circuit.
Preferably, the current calculating module 11 includes a first resistor R1, a second resistor R2, a third resistor R3, and a first operational amplifier OPAl;
the resistance value of the first resistor R1 is (n-1) times that of the second resistor R2;
one end of the first resistor R1 and one end of the second resistor R2 are connected with the positive input end of the first operational amplifier OPAl;
the other end of the first resistor R1 is connected with a reference voltage Vg;
the other end of the second resistor R2 is grounded;
one end of the third resistor R3 is connected with the negative input end of the first operational amplifier OPAl, and the other end of the third resistor R is grounded;
the output of the first operational amplifier OPAl outputs the calculated voltage Vi.
Preferably, the current calculating module 11 is configured to calculate the calculated voltage Vi, vi=vg/n+δv according to the reference voltage Vg, the offset voltage δv, and the transformer turn ratio n.
Preferably, the current calculating module 11 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first operational amplifier OPAl, and an offset voltage generating circuit 19;
the offset voltage generating circuit 19 is configured to output an offset voltage δv, where δv is a negative voltage;
the resistance value of the first resistor R1 is (n-1) times that of the second resistor R2;
one end of the first resistor R1 and one end of the second resistor R2 are connected with the positive input end of the first operational amplifier OPAl;
the other end of the first resistor R1 is connected with a reference voltage Vg;
the other end of the second resistor R2 is grounded;
one end of the third resistor R3 is connected with the negative input end of the first operational amplifier OPAl, and the other end of the third resistor R is grounded;
one end of the fourth resistor R4 and one end of the fifth resistor R5 are connected with the negative input end of the first operational amplifier OPAl;
the other end of the fourth resistor R4 is connected with the output end of the first operational amplifier OPAl.
The other end of the fifth resistor R5 is connected with offset voltage δv;
the other end of the fourth resistor R4 is connected with the output end of the first operational amplifier OPAl;
the output of the first operational amplifier OPAl outputs the calculated voltage Vi.
Preferably, the resistance power of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 is 1/4W.
Preferably, R4>10R5, r4=r3.
The inverter welding machine output control circuit of the utility model, the voltage control mode module 13, the current control mode module 14 adopt the same clock, the error amplifier 10 amplifies the reference voltage Vg and welding power supply output feedback signal (welding power supply output voltage or feedback signal of output current) error that Vout produces, output error amplified voltage Ve to the voltage control mode module 13, the voltage control mode module 13 compares error amplified voltage Ve with sawtooth wave Vr and forms the voltage control voltage output pulse Vpmv to output to an input end of the AND circuit 15 in synchronization with the synchronous clock; the current calculation module 11 calculates a calculated voltage Vi according to the reference voltage Vg and the transformer turn ratio n, and the current control mode module 14 compares the calculated voltage Vi with a current feedback signal Vpre output by the driving inverter circuit 16 and synchronizes with a synchronous clock to form a current control voltage output pulse Vpwmi, and outputs the current control voltage output pulse Vpwmi to the other input end of the and circuit 15; the and circuit 15 outputs a PWM signal to a control terminal of a switching transistor of the driving inverter circuit 16 by taking the input voltage control voltage output pulse Vpwmv and the current control voltage output pulse Vpwmi into account. The voltage control mode module 13 is used for controlling the normal output current of the inverter welding machine, the current control mode module 14 is used for controlling the output current when the load of the inverter welding machine changes instantaneously (or is short-circuited), that is, when the load of the inverter welding machine changes normally, the voltage control mode module 13 is used, and when the load of the inverter welding machine changes instantaneously, such as is short-circuited, the voltage control mode module 13 is closed in advance to enable the pulse width to shrink as soon as possible to limit the current output. The inverter welder output control circuit has low sensitivity to noise in the power stage, is not influenced by other parameters of the circuit, can respond quickly to the current flowing through the switching tube for driving the inverter circuit 16 when the load changes suddenly and even is short-circuited, and can control the current flowing through the switching tube to ensure that the switching tube cannot have an overcurrent problem.
Drawings
In order to more clearly illustrate the technical solutions of the present utility model, the following brief description of the drawings is given for the purpose of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without the need for inventive work for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art voltage control scheme for inverter welder power output;
FIG. 2 is a schematic diagram of a prior art current control mode of inverter welder power output;
FIG. 3 is a functional block diagram of one embodiment of an inverter welder output control circuit of the utility model;
FIG. 4 is a circuit diagram of a current calculation module of an embodiment of an inverter welder output control circuit of the present utility model.
Reference numerals in the drawings illustrate
An error amplifier 10; 11 a current calculation module; 12, synchronizing a clock module; 13 a voltage control mode module; 14 a current control mode module; 15 and a circuit; 16 driving an inverter circuit; a 17 transformer; 18 rectifying the output circuit; 19 offset voltage generating circuit.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by a person skilled in the art based on the embodiments of the utility model without any inventive effort, are intended to fall within the scope of the utility model.
The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.
Example 1
As shown in fig. 3, the inverter welder output control circuit comprises an error amplifier 10, a current calculation module 11, a synchronous clock module 12, a voltage control mode module 13, a current control mode module 14, an and circuit 15, a driving inverter circuit 16, a transformer 17 and a rectification output circuit 18;
the synchronous Clock module 12 is configured to provide the same Clock signal Clock to the voltage control mode module 13 and the current control mode module 14;
the positive and negative input ends of the error amplifier 10 are respectively connected with a reference voltage Vg and a welding power supply output feedback signal (feedback voltage) Vout, and output an error amplified voltage Ve to a voltage control mode module 13;
the voltage control mode module 13 compares the error amplified voltage Ve with the sawtooth wave Vr to form a voltage control voltage output pulse Vpwmv, and outputs the voltage control voltage output pulse Vpwmv to an input end of the and circuit 15;
the current calculation module 11 is configured to calculate a calculated voltage Vi according to the reference voltage Vg and the transformer turn ratio n, where vi=vg/n;
the current control mode module 14 compares the calculated voltage Vi with the current feedback signal Vpre output by the driving inverter circuit 16 to form a current control voltage output pulse Vpwmi, and outputs the current control voltage output pulse Vpwmi to the other input terminal of the and circuit 15;
the and circuit 15 performs phase-to-phase operation on the input voltage control voltage output pulse Vpwmv and the current control voltage output pulse Vpwmi, and outputs a PWM signal to a control terminal of a switching transistor driving the inverter circuit 16;
the output end of the driving inverter circuit 16 is connected with one end of a primary winding of the transformer 17;
the secondary winding of the transformer 17 is connected with a rectification output circuit 18;
the rectification output circuit 18 rectifies and outputs the output of the secondary winding of the transformer 17.
The calculated current Ie is determined according to the reference current Ig and the transformer turn ratio n, and the specific formula is ie=ig/n. According to the fact that the ratio of the primary current to the secondary current of the transformer is inversely proportional to the turn ratio, ipre (peak value) ≡iout/n, ipre is the primary current of the transformer, iout is the welding power output current (feedback current), and the expected welding power output current (feedback current) Iout should be equal to the reference current Ig, so the calculated current Ie controlling the peak value of the primary current Ipre of the transformer should be approximately equal to Ig/n; replacing the current correspondence with a voltage, there is vi=vg/n.
In the inverter welding machine output control circuit of the first embodiment, the voltage control mode module 13 and the current control mode module 14 adopt the same clock, the error amplifier 10 amplifies an error generated by the reference voltage Vg and the welding power output feedback signal (the welding power output voltage or the feedback signal of the output current) Vout, and outputs the error amplified voltage Ve to the voltage control mode module 13, and the voltage control mode module 13 compares the error amplified voltage Ve with the sawtooth wave Vr and synchronizes with the synchronous clock to form a voltage control voltage output pulse Vpwmv to be output to one input end of the and circuit 15; the current calculation module 11 calculates a calculated voltage Vi according to the reference voltage Vg and the transformer turn ratio n, and the current control mode module 14 compares the calculated voltage Vi with a current feedback signal Vpre output by the driving inverter circuit 16 and synchronizes with a synchronous clock to form a current control voltage output pulse Vpwmi, and outputs the current control voltage output pulse Vpwmi to the other input end of the and circuit 15; the and circuit 15 outputs a PWM signal to a control terminal of a switching transistor of the driving inverter circuit 16 by taking the input voltage control voltage output pulse Vpwmv and the current control voltage output pulse Vpwmi into account. The voltage control mode module 13 is used for controlling the normal output current of the inverter welding machine, the current control mode module 14 is used for controlling the output current when the load of the inverter welding machine changes instantaneously (or is short-circuited), that is, when the load of the inverter welding machine changes normally, the voltage control mode module 13 is used, and when the load of the inverter welding machine changes instantaneously, such as is short-circuited, the voltage control mode module 13 is closed in advance to enable the pulse width to shrink as soon as possible to limit the current output.
The inverter welder output control circuit of the first embodiment has low sensitivity to noise in the power stage, is not affected by other parameters of the circuit, can quickly respond to the current flowing through the switching tube for driving the inverter circuit 16 when the load changes suddenly or even is short-circuited, and can control the current flowing through the switching tube to ensure that the switching tube cannot have an overcurrent problem.
Example two
The inverter welding machine output control circuit according to the first embodiment, the voltage control mode module 13 includes a first PWM comparator and a first latch;
the positive input end and the negative input end of the first PWM comparator are respectively connected with the error amplification voltage Ve and the sawtooth wave Vr, and the output end of the first PWM comparator is connected with the R end of the first latch;
the first latch has its S terminal connected to the Clock signal Clock and its Q terminal outputting the voltage control voltage output pulse Vpwmv to one input terminal of the and circuit 15.
Preferably, the current control mode module 14 includes a second PWM comparator and a second latch;
the positive input end and the negative input end of the second PWM comparator are respectively connected with the calculated voltage Vi and the current feedback signal Vpre output by the driving inverter circuit 16, and the output end of the second PWM comparator is connected with the R end of the second latch;
the second latch has its S terminal connected to the Clock signal Clock and its Q terminal outputting the current control voltage output pulse Vpwmi to the other input terminal of the and circuit 15.
Preferably, the driving inverter circuit 16 employs a single switching tube or an H-bridge PWM driving circuit.
Example III
Referring to fig. 4, the current calculation module 11 includes a first resistor R1, a second resistor R2, a third resistor R3, and a first operational amplifier OPAl;
the resistance value of the first resistor R1 is (n-1) times that of the second resistor R2;
one end of the first resistor R1 and one end of the second resistor R2 are connected with the positive input end of the first operational amplifier OPAl;
the other end of the first resistor R1 is connected with a reference voltage Vg;
the other end of the second resistor R2 is grounded;
one end of the third resistor R3 is connected with the negative input end of the first operational amplifier OPAl, and the other end of the third resistor R is grounded;
the output of the first operational amplifier OPAl outputs the calculated voltage Vi.
Example IV
The inverter welding machine output control circuit according to the first embodiment is characterized in that the current calculation module 11 is configured to calculate a calculated voltage Vi, vi=vg/n+δv according to the reference voltage Vg, the offset voltage δv, and the transformer turn ratio n.
The calculated current Ie is determined according to three parameters of a reference current Ig, a transformer turn ratio n and an offset current δi, and a specific formula is ie=ig/n+δi. According to the fact that the ratio of the primary current to the secondary current of the transformer is inversely proportional to the turn ratio, ipre (peak value) ≡iout/n, ipre is the primary current of the transformer, iout is the welding power output current (feedback current), and the expected welding power output current (feedback current) Iout should be equal to the reference current Ig, so the calculated current Ie controlling the peak value of the primary current Ipre of the transformer should be approximately equal to Ig/n; replacing the current correspondence with a voltage, there is vi=vg/n+δv.
The offset voltage δv (offset current δi) is determined according to the primary inductance of the transformer 16 and the power level noise, so that a certain space is reserved for current loop calculation, and the noise can not affect the inverter welding machine during normal operation.
Example five
As shown in fig. 4, the current calculation module 11 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first operational amplifier OPAl, and an offset voltage generation circuit 19;
the offset voltage generating circuit 19 is configured to output an offset voltage δv, where δv is a negative voltage;
the resistance value of the first resistor R1 is (n-1) times that of the second resistor R2;
one end of the first resistor R1 and one end of the second resistor R2 are connected with the positive input end of the first operational amplifier OPAl;
the other end of the first resistor R1 is connected with a reference voltage Vg;
the other end of the second resistor R2 is grounded;
one end of the third resistor R3 is connected with the negative input end of the first operational amplifier OPAl, and the other end of the third resistor R is grounded;
one end of the fourth resistor R4 and one end of the fifth resistor R5 are connected with the negative input end of the first operational amplifier OPAl;
the other end of the fourth resistor R4 is connected with the output end of the first operational amplifier OPAl.
The other end of the fifth resistor R5 is connected with offset voltage δv;
the other end of the fourth resistor R4 is connected with the output end of the first operational amplifier OPAl;
the output of the first operational amplifier OPAl outputs the calculated voltage Vi.
Preferably, the resistance power of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 is 1/4W.
Preferably, R4>10R5, r4=r3.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the utility model.
Claims (9)
1. An output control circuit of an inverter welding machine is characterized by comprising an error amplifier (10), a current calculation module (11), a synchronous clock module (12), a voltage control mode module (13), a current control mode module (14), an AND circuit (15), a driving inverter circuit (16), a transformer (17) and a rectification output circuit (18);
the synchronous Clock module (12) is used for providing the same Clock signal (Clock) for the voltage control mode module (13) and the current control mode module (14);
the positive and negative input ends of the error amplifier (10) are respectively connected with a reference voltage Vg and a welding power supply output feedback signal (Vout), and the error amplifier outputs an error amplified voltage (Ve) to a voltage control mode module (13);
the voltage control mode module (13) compares the error amplified voltage (Ve) with a sawtooth wave (Vr) to form a voltage control voltage output pulse (Vpwmv) and outputs the voltage control voltage output pulse (Vpwmv) to one input end of the and circuit (15);
the current calculation module (11) is used for calculating the calculated voltage Vi according to the reference voltage Vg and the transformer turn ratio n, wherein Vi=Vg/n;
the current control mode module (14) compares the calculated voltage Vi with a current feedback signal (Vpre) output by the driving inverter circuit (16) to form a current control voltage output pulse (Vpwmi) and outputs the current control voltage output pulse (Vpwmi) to the other input end of the AND circuit (15);
the AND circuit (15) phase-outputs an input voltage control voltage output pulse (Vpmv) and a current control voltage output pulse (Vpmi) to a control end of a switching tube of the driving inverter circuit (16);
the output end of the driving inverter circuit (16) is connected with one end of a primary winding of the transformer (17);
a secondary winding of the transformer (17) is connected with a rectifying output circuit (18);
the rectification output circuit (18) rectifies and outputs the output of the secondary winding of the transformer (17).
2. The inverter welder output control circuit of claim 1, wherein,
the voltage control mode module (13) comprises a first PWM comparator and a first latch;
the positive input end and the negative input end of the first PWM comparator are respectively connected with error amplification voltage (Ve) and sawtooth wave (Vr), and the output end of the first PWM comparator is connected with the R end of the first latch;
the first latch has its S terminal connected to a Clock signal (Clock) and its Q terminal outputting a voltage control voltage output pulse (Vpmv) to one input terminal of the AND circuit (15).
3. The inverter welder output control circuit of claim 1, wherein,
the current control mode module (14) includes a second PWM comparator and a second latch;
the positive input end and the negative input end of the second PWM comparator are respectively connected with the calculated voltage Vi and the output current feedback signal (Vpre) of the driving inverter circuit (16), and the output end of the second PWM comparator is connected with the R end of the second latch;
the second latch has its S terminal connected to a Clock signal (Clock) and its Q terminal outputting a current control voltage output pulse (Vpwmi) to the other input terminal of the AND circuit (15).
4. The inverter welder output control circuit of claim 1, wherein,
the driving inverter circuit (16) adopts a single switching tube or an H-bridge PWM driving circuit.
5. The inverter welder output control circuit of claim 1, wherein,
the current calculation module (11) comprises a first resistor (R1), a second resistor R2, a third resistor R3 and a first operational amplifier (OPAl);
the resistance value of the first resistor (R1) is (n-1) times that of the second resistor R2;
one end of the first resistor (R1) and one end of the second resistor (R2) are connected with the positive input end of the first operational amplifier (OPAl);
the other end of the first resistor (R1) is connected with a reference voltage Vg;
the other end of the second resistor R2 is grounded;
one end of the third resistor R3 is connected with the negative input end of the first operational amplifier (OPAl), and the other end of the third resistor R3 is grounded;
the output of the first operational amplifier (OPAl) outputs a calculated voltage Vi.
6. The inverter welder output control circuit of claim 1, wherein,
the current calculation module (11) is used for calculating the calculated voltage Vi according to the reference voltage Vg, the offset voltage δv and the transformer turn ratio n, wherein Vi=Vg/n+δv.
7. The inverter welder output control circuit of claim 6, wherein,
the current calculation module (11) comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first operational amplifier (OPAl) and an offset voltage generation circuit (19);
the offset voltage generation circuit (19) is used for outputting offset voltage delta v, wherein the offset voltage delta v is a negative voltage;
the resistance value of the first resistor R1 is (n-1) times that of the second resistor R2;
one end of the first resistor R1 and one end of the second resistor R2 are connected with the positive input end of the first operational amplifier (OPAl);
the other end of the first resistor R1 is connected with a reference voltage Vg;
the other end of the second resistor R2 is grounded;
one end of the third resistor R3 is connected with the negative input end of the first operational amplifier (OPAl), and the other end of the third resistor R3 is grounded;
one end of the fourth resistor R4 and one end of the fifth resistor R5 are connected with the negative input end of the first operational amplifier (OPAl);
the other end of the fourth resistor R4 is connected with the output end of the first operational amplifier (OPAl);
the other end of the fifth resistor R5 is connected with offset voltage δv;
the other end of the fourth resistor R4 is connected with the output end of the first operational amplifier (OPAl);
the output of the first operational amplifier (OPAl) outputs a calculated voltage Vi.
8. The inverter welder output control circuit of claim 7, wherein,
the tolerance power of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 is 1/4W.
9. The inverter welder output control circuit of claim 7, wherein,
R4>10R5，R4=R3。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223559992.0U CN219093931U (en) | 2022-12-30 | 2022-12-30 | Output control circuit of inverter welding machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223559992.0U CN219093931U (en) | 2022-12-30 | 2022-12-30 | Output control circuit of inverter welding machine |
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